PT-2019-14044 · Valve · Steam Client

Published 2019-08-21 · Updated 2020-08-24 · CVE-2019-15315

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Valve Steam Client for Windows versions prior to 2019-08-16

Description The issue allows local users to escalate privileges to NT AUTHORITYSYSTEM. This is possible because local users can replace the current versions of SteamService.exe and SteamService.dll with older versions that lack a specific security patch.

Recommendations For versions prior to 2019-08-16, update to a version that includes the necessary security patch to prevent privilege escalation.

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2019-15315

Affected Products

Steam Client

References · 3

• https://osv.dev/vulnerability/CVE-2019-15315 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-15315 · Security Note
• https://xiaoyinl.github.io/steam_EoP_bypass.html · Note